CVE-2026-58532: Microsoft Windows Kernel integer overflow privilege escalation

CVE-2026-58532 · Severity: high · CVSS 7.8 · Published 2026-07-14

A vulnerability in the Windows Kernel could allow a user who is already logged into a system to gain full administrative control. The Windows Kernel is the core part of the operating system that manages hardware and system resources. If exploited, an attacker could bypass security restrictions to access sensitive data, install malicious software, or disrupt business operations.

Technologies: Microsoft Windows 11, Microsoft Windows 10, Microsoft Windows Server 2012. Vendors: Microsoft.

Quick answers

Is CVE-2026-58532 exploited in the wild?
No. Junglewise Threat Intelligence has no report of CVE-2026-58532 being exploited in the wild.
How severe is CVE-2026-58532?
High severity, with a CVSS score of 7.8, published 14 July 2026.
Which products and versions are affected?
Microsoft Windows 11 Versions 24H2, 25H2, 26H1; Microsoft Windows 10 Versions 1607, 1809, 21H2, 22H2; Microsoft Windows Server 2012 All editions including Server Core.
Is there a fix for CVE-2026-58532?
No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.
How is CVE-2026-58532 attacked?
It is attacked with local access, in an operating system.
Am I affected by CVE-2026-58532?
Check whether you run Microsoft Windows 11, Microsoft Windows 10 or Microsoft Windows Server 2012 at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

Technical details

An integer overflow or wraparound vulnerability (CWE-190) exists within the Windows Kernel. The flaw is triggered when the kernel improperly handles specific arithmetic operations, leading to memory corruption or logic errors. An attacker with local access and low-level privileges can exploit this to execute code in kernel mode, effectively gaining full SYSTEM privileges. The attack requires no user interaction but does require the attacker to have an existing authorized account on the target machine. Microsoft has released security updates to address this issue across various versions of Windows 10, Windows 11, and Windows Server 2012.

Affected products

  • Microsoft Windows 10 Versions 1607, 1809, 21H2, 22H2
  • Microsoft Windows 11 Versions 24H2, 25H2, 26H1
  • Microsoft Windows Server 2012 All editions including Server Core

Timeline

  • 2026-07-14: disclosed: Initial publication by Microsoft and NVD
  • 2026-07-14: advisory: Microsoft Security Update Guide published for CVE-2026-58532

References

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